# --------------------------------------------------------------------------
#
# Copyright (c) Microsoft Corporation. All rights reserved.
#
# The MIT License (MIT)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the ""Software""), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
# --------------------------------------------------------------------------

from enum import EnumMeta


class CaseInsensitiveEnumMeta(EnumMeta):
    """Enum metaclass to allow for interoperability with case-insensitive strings.

    Consuming this metaclass in an SDK should be done in the following manner:

    .. code-block:: python

        from enum import Enum
        from six import with_metaclass
        from azure.core import CaseInsensitiveEnumMeta

        class MyCustomEnum(with_metaclass(CaseInsensitiveEnumMeta, str, Enum)):
            FOO = 'foo'
            BAR = 'bar'

    """

    def __getitem__(cls, name):
        # disabling pylint bc of pylint bug https://github.com/PyCQA/astroid/issues/713
        return super(CaseInsensitiveEnumMeta, cls).__getitem__(name.upper())  # pylint: disable=no-value-for-parameter

    def __getattr__(cls, name):
        """Return the enum member matching `name`
        We use __getattr__ instead of descriptors or inserting into the enum
        class' __dict__ in order to support `name` and `value` being both
        properties for enum members (which live in the class' __dict__) and
        enum members themselves.
        """
        try:
            return cls._member_map_[name.upper()]
        except KeyError:
            raise AttributeError(name)
